Why would oil be leaking from a blow off valve?i own a 05' gti 1.8t, i have had the blow off valve for about a year now, its a HKS SSQV, but i just revently noticed that when it blows off, there is a spray of oil that comes out..... why would it be leaking oil through the blow off valve? i know VW dont really go well with blow off valves, but it hasnt given me any problems until recently....
vw has a pcv system it recirculates the crankcase air into the intake, your car if fairly new, but this is most likely the problem. at least its the most simple to check / fix. i dought the turbo is gone if its the stock ko3s, they can take a beating. the pcv valve is the black saucer shaped peice (kinda looks like the stock diverter valve) , its in the TIP by your N75 valve. these get filled with oil and start to dump in into the intake. did you switch the set up to run the BOV on the cold side? like off the throtal body hose? if so, this could STILL be the problem. if you take off your lower inercooler pipe and look inside for oil build up. and pull the n75 valve out and check it for oil. id think aboout replacing the pcv valve with a catch can. your real problem is yet to be noticed if your dumping the air out and not recirculating it into the intake, the car WILL RUN RICH, as it reads the air it adds fuel, but with a BOV your loosing some air BUT keeping the fuel. so id expect to see some bad cats and o2 sensors good luck
Most likely oil wouldn't leak from your BOV. I would either think it's your intercooler or air filter (depending on your setup) that's bad because with so much air being drawn, a lot of moisture (especially in high humidity or wet days) and sum dirt is built up and compressed and we all know cold compressed air liquifies, or it could also be because your bov timing is off so too much air is too greatly compressed when the throttle is shut that the air liquifies and is spit out the BOV. Take apart your turbo intake tubing and see if there's liquid on the walls. If the problem starts from something blocking your BOV, than it will enter a repeating cycle because the liquid will prevent the excess air from being released and it will build and liquify even more. I guess it could also be because the hot side heats the air before it's compressed, therefore creating liquids but then just about every BOV would spray liquids. If it is oil, it's coming from your turbo so some seal is probably broken. If it is, than you need to get your waste gate fixed along with the seal because that's what controls your turbine speed.
It is turbo rebuild time sorry The internal shaft seal has gone bad and if you don't act fast the impeller and shaft might not be able to be saved. Also if you don't heed that warning the impellers can strike the turbo housing and pieces can be blown into the engine.
I'm having a very similar problem, i'm thinking the turbo might be damaged and leaking oil.
